84 lines
1.5 KiB
JavaScript
84 lines
1.5 KiB
JavaScript
$(function() {
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// We use an inline data source in the example, usually data would
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// be fetched from a server
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var data = [],
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totalPoints = 300;
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function getRandomData() {
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if (data.length > 0)
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data = data.slice(1);
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// Do a random walk
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while (data.length < totalPoints) {
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var prev = data.length > 0 ? data[data.length - 1] : 50,
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y = prev + Math.random() * 10 - 5;
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if (y < 0) {
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y = 0;
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} else if (y > 100) {
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y = 100;
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}
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data.push(y);
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}
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// Zip the generated y values with the x values
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var res = [];
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for (var i = 0; i < data.length; ++i) {
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res.push([i, data[i]])
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}
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return res;
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}
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// Set up the control widget
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var updateInterval = 10;
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$("#updateInterval").val(updateInterval).change(function () {
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var v = $(this).val();
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if (v && !isNaN(+v)) {
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updateInterval = +v;
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if (updateInterval < 1) {
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updateInterval = 1;
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} else if (updateInterval > 2000) {
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updateInterval = 2000;
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}
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$(this).val("" + updateInterval);
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}
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});
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var plot = $.plot("#placeholder", [ getRandomData() ], {
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series: {
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shadowSize: 0 // Drawing is faster without shadows
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},
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yaxis: {
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min: 0,
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max: 100
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},
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xaxis: {
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show: false
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}
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});
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function update() {
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plot.setData([getRandomData()]);
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// Since the axes don't change, we don't need to call plot.setupGrid()
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plot.draw();
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setTimeout(update, updateInterval);
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}
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update();
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// Add the Flot version string to the footer
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$("#footer").prepend("Flot " + $.plot.version + " – ");
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}); |